Overview
IEC 62747:2014 is an international standard published by the International Electrotechnical Commission (IEC). It establishes consistent and precise terminology for voltage-sourced converters (VSC) used in high-voltage direct current (HVDC) power transmission systems. This standard mainly addresses the use of insulated gate bipolar transistors (IGBTs) within VSCs, but its terminology is also applicable to other self-commutated semiconductor devices capable of being turned on and off by control signals.
By providing a harmonized vocabulary, IEC 62747:2014 supports clear communication, system design, deployment, and operation of HVDC systems based on VSC technology, which has become increasingly important for modern energy transmission due to its grid integration flexibility and suitability for renewable energy sources.
Key Topics
The content of IEC 62747:2014 covers the foundational vocabulary for VSC-based HVDC systems, ensuring stakeholders use universally understood terms. Key topics include:
- General converter terminology: Definitions for concepts such as conversion, commutation, and converter types specific to HVDC applications.
- VSC-specific concepts: Clear explanation of terms related to VSC operation, such as self-commutation, modulation index, and operation modes (rectifier, inverter, STATCOM).
- Topologies and components: Standardized names for VSC topologies (e.g., modular multilevel converter - MMC, cascaded two-level converter - CTL) and components including IGBTs, free-wheeling diodes, submodules, arm inductors, and d.c. capacitors.
- Circuit and system elements: Distinctions between items like phase units, converters, substations, and interface transformers.
- Operation and control vocabulary: Terms for various operation states (idling, blocked, charging), controls strategies, and system management concepts.
This standard specifically excludes terminology for line-commutated and current-sourced converters used in HVDC systems.
Applications
IEC 62747:2014 is essential for organizations involved in the planning, design, implementation, testing, and maintenance of HVDC transmission projects based on VSC technology. Key applications include:
- System design and specification: Enables component suppliers, system integrators, and utilities to communicate requirements and system functionalities efficiently.
- Technical documentation and training: Facilitates the creation of clear instructions, operation manuals, and training materials for HVDC engineers and operators.
- Tendering and procurement: Supports clear and unambiguous documentation for bids and contracts, reducing misinterpretation risks.
- Research and development: Guides researchers and product developers in using consistent terminology when exploring innovations in VSC-HVDC, such as new topologies or optimized control methods.
- International projects: As projects cross borders, adherence to IEC 62747 terminology ensures effective collaboration between multinational teams, regulators, and equipment manufacturers.
Related Standards
Several other IEC standards complement IEC 62747:2014 and are relevant to the HVDC and VSC field. Notable related standards include:
- IEC 60633: Provides general terminology specific to high-voltage direct current (HVDC) transmission.
- IEC 60027: Establishes letter symbols to be used in electrical technology.
- IEC 60617: Details graphical symbols for diagrams used in electrical installations and systems.
- Other VSC-HVDC standards: These relate to system design, performance requirements, testing procedures, and operational guidelines for HVDC converter stations and equipment.
By aligning with these standards, users can ensure systematic and internationally recognized terminology and practices throughout VSC-HVDC system lifecycles, supporting interoperability, safety, and quality in energy infrastructure worldwide.
Keywords: IEC 62747, voltage-sourced converter, VSC, HVDC system, insulated gate bipolar transistor, IGBT, terminologies, high-voltage direct current, modular multilevel converter, power transmission standard, international standard, converter terminology, VSC-HVDC applications, energy transmission.